import machine
import time
import json # The most important library for this module


# --- Configuration ---
DEVICE_ID = "PICO_W_BLDG_01"
LOCATION  = "Server_Room"


# Setup Internal Temp Sensor 
sensor_temp = machine.ADC(4)
conversion_factor = 3.3 / 65535


print("Experiment 4.1: JSON Packaging Started...")
print("-" * 40)


while True:
   # 1. SENSE: Get Raw Data
   reading = sensor_temp.read_u16() * conversion_factor
   temperature = 27 - (reading - 0.706)/0.001721
  
   # 2. STRUCTURE: Create a Python Dictionary
   # This is where we define the 'Schema' or the identity of our data
   data_dictionary = {
       "sensor_id": DEVICE_ID,
       "location": LOCATION,
       "telemetry": {
           "temp": round(temperature, 2),
           "unit": "Celsius"
       },
       "timestamp_ms": time.ticks_ms(), # Relative time since boot
       "status": "OK"
   }
  
   # 3. TRANSLATE: Serialize to JSON String
   # 'json.dumps' (Dump String) turns the dictionary into a standardized JSON text
   json_packet = json.dumps(data_dictionary)
  
   # 4. OUTPUT: Send to Console/Serial
   # In a real IoT system, this string would be sent to an MQTT Broker or Web API
   print(f"RAW DICTIONARY: {data_dictionary}")
   print(f"JSON PACKET:    {json_packet}")
  
   # Verification of data type
   print(f"DATA TYPE:      {type(json_packet)}")
  
   print("-" * 40)
   time.sleep(5)